In the GCE A Levels, you will be asked to analyse current-voltage characteristic graphs (or I-V graphs) of various components. This video focuses on how to interpret the I-V graph of a filament lamp, or metals in general, and we will see that the I-V graph shows that the resistance increases as the potential difference across the filament lamp increases. The video will describe why this happens, including balancing the effects of increased thermal lattice vibrations and increased charge carrier concentrations.
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